JS模拟select控件的代码

浏览数：25 / 时间：2015年06月09日

用JavaScript模拟实现Select下拉选框功能，在本效果的实现上，背景图片起到了非常重要的美化作用，然后用CSS和JS分别对LI进行控制，最终实现漂亮的Select效果。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>石家庄渣浆泵配件</title>
<style> 
html,body{height:100%;overflow:hidden;}
body,div,form,h2,ul,li{margin:0;padding:0;}
ul{list-style-type:none;}
body{background:#23384e;font:12px/1.5 \5fae\8f6f\96c5\9ed1;}
#search,#search form,#search .box,#search .select,#search a{background:url/jscss/demoimg/201211/search.jpg) no-repeat;}
#search,#search .box,#search form{height:34px;}
#search{position:relative;width:350px;margin:10px auto;}
#search .box{background-position:right 0;}
#search form{background-repeat:repeat-x;background-position:0 -34px;margin:0 20px 0 40px;}
#search .select{float:left;color:#fff;width:190px;height:22px;cursor:pointer;margin-top:4px;line-height:22px;padding-left:10px;background-position:0 -68px;}
#search a{float:left;width:80px;height:24px;color:#333;letter-spacing:4px;line-height:22px;text-align:center;text-decoration:none;background-position:0 -90px;margin:4px 0 0 10px;}
#search a:hover{color:#f60;background-position:-80px -90px;}
#search .sub{position:absolute;top:26px;left:40px;color:#fff;width:198px;background:#2b2b2b;border:1px solid #fff;display:none;}
#search .sub li{height:25px;line-height:24px;cursor:pointer;padding-left:10px;margin-bottom:-1px;border-bottom:1px dotted #fff;}
#search .sub li.hover{background:#8b8b8b;}
</style>
<script type="text/javascript"> 
window.onload = function ()
{
    var oSelect = document.getElementsByTagName("span")[0];
    var oSub = document.getElementsByTagName("ul")[0];
    var aLi = oSub.getElementsByTagName("li");
    var i = 0;
    
    oSelect.onclick = function (event)
    {
        var style = oSub.style;
        style.display = style.display == "block" ? "none" : "block";
        //阻止事件冒泡
        (event || window.event).cancelBubble = true
    };
    
    for (i = 0; i < aLi.length; i++)
    {
        //鼠标划过
        aLi[i].onmouseover = function ()
        {
            this.className = "hover"
        };
        //鼠标离开
        aLi[i].onmouseout = function ()
        {
            this.className = "";
        };
        //鼠标点击
        aLi[i].onclick = function ()
        {
            oSelect.innerHTML = this.innerHTML    
        }
    }
    
    document.onclick = function ()
    {
        oSub.style.display = "none";    
    };
};
</script>
</head>
<body>
<div id="search">
    <div class="box">
        <form>
            <span class="select">请选择游戏名称</span>        
            <a href="javascript:;">搜索</a>
        </form>
    </div>
    <ul class="sub">
        <li>地下城与勇士</li>
        <li>魔兽世界（国服）</li>
        <li>魔兽世界（台服）</li>
        <li>热血江湖</li>
        <li>神鬼传奇</li>
        <li>大话西游II</li>
        <li>QQ幻想世界</li>
    </ul>
</div>
</body>
</html>